Take a look at Mr. Garret's videos on youtube, Garret Cartridge 45/70, think a 405 cast at 1400 to 1500 fps would be more than adequate. Take a peek at the bullet tests page, right up from the reloading page. Should be able to find some useful info.
Duty is the sublimest word in the English language. Every man should desire to do his duty, no man should desire to do less. Robert E Lee.
Marlinitis Symptoms: More Daily!
Active rescuer of Marlin Rifles, S&W revolvers, 1911's, Mil/Surplus rifles, shotguns.............